See technology of off-gas treatment of this 10 big industry, you administer an expert with respect to the waste gas that makes a qualification!

In recent years, as human activity frequent, air is polluted more and more more serious. Consider to make clear, industrial waste gas contains the chemical material such as organic compound, sulfide, fluoride, these material endanger human body health badly, increase respiratory tract greatly the incidence of a disease of relevant cancer. Benzene kind the central nervous that organic matter injures a person, cause aromatic hydrocarbon of much annulus of neurological obstacle; organic matter has the intense sex that cause cancer, the gas that contains sulfide enters human body, basically damage central nervous, respiratory system, ; of exciting mucous membrane absorbs the gas that contains fluoride for a long time, cause brain function loss, affect cellular metabolization and protein synthesis. As the ceaseless development of socioeconomy, the environmental protection consciousness of people is strengthened stage by stage, to environmental quality the demand becomes higher. In future, the control of air pollution content and degradation are prospective environment science necessarily one of main research direction. Next, arranged the craft of off-gas treatment of 10 kinds of industry to everybody, full dried food and nuts, make the best of time to collect.

　The method of industrial off-gas treatment

Sort of waste gas contaminant is various, characteristic each different, be aimed at the waste gas of different type, select right processing kind. Commonly used processing technique has: Condensation law, absorb law, combustion law, catalysis law, adsorptive law to wait.

　　 1, condensation absorption method

Condensation absorption method is after guide waste gas into condenser directly or be being absorbed via adsorption first, analytic inspissation waste gas guides condenser, condensate can reclaim via depart a kind of method of valuable organic matter.

Technological process pursues as follows:

Advantage: Condensation law basically uses what VOC pollutes gas at high boiling point and tall pH indicator to reclaim, applicable chroma limits > 5%(bulk) , its flow is simple, reclaim rate is high.

Defect: This law needs to have the frozen plant of have as an attached institution, invest big, specific power consumption tall, moving fee is big, at the same time the tail gas after condensation still contains certain pH indicator organic matter, 2 pollution are serious, because this is opposite,low density tail gas administers this law to be used rarely.

2, absorb a law

Absorb a law to be able to be divided absorb for chemistry reach physics to absorb, because be contained in organic waste gas many ” 3 benzene ” gas, chemical active is low, cannot use chemistry to absorb commonly.

Physics is absorbed is waste gas in one plant or a few kinds of constituent are deliquescent in the liquid absorbefacient at make choice of, this kind of absorbefacient should be had with absorb constituent to have taller affinity, low volatile, still should have at the same time lesser volatile, after absorbing fluid saturation, via heating desorption cools again reuse.

Common technological process pursues as follows:

Advantage: Agree with temperature is low, medium waste gas of tall pH indicator, can have absorb the waste gas such as vulcanization hydrogen optionally, technological process is simple, and do not want adscititious vapour and adscititious and other heat source.

Defect: Need to deploy heat analytic condensation reclaim device, outfit airframe is accumulated investment is big, larger, still exist 2 times to pollute at the same time, purify the effect not ideal.

3, direct combustion law

Direct combustion law is to use the quantity of heat that lights the auxiliary fuel combustion such as gas or fuel to give off to heat gas mixture constant temperature (700 ～ 800 ℃ ) , be stationed in the time with stay proper (0.5 seconds of 0.3 ～ ) , make combustible harmful material undertakes pyrolysis turns into a kind of method of harmless material.

Technological process pursues as follows:

Advantage: Craft of direct combustion law simple, installation cost is small, the waste gas of applicable high concentration, small wind force is administered.

Defect: Specific power consumption is big, taller; runs moving cost technical demand is high, not easy control and master, did not win promotion basically in home.

4, law of heating power combustion

Heating power combustion is the temperature that points to a waste gas temperature to rise to be able to light gaseous contaminant, the process that makes its undertake oxidizing completely decomposing.

Technological process pursues as follows:

Advantage: Apply to what can burn the waste gas with organic material inferior content to purify processing, the thermal efficiency in lighting burn out to change processing technology is very tall, service life of equipment is long, fight ageing, anti-corrosive.

Defect: Facility is larger, price of equipment of carriage inconvenience; is high, moving cost tall; is sulfur, haloid to containing organic matter off-gas treatment effect is poorer.

5, catalytic combustion law

Catalytic combustion is to be below the action of activator, waste gas medium harmful can light constituent the process of carbon dioxide of complete oxygen melt into and water.

Technological process pursues as follows:

Advantage: Catalytic combustion implement purifying rate low, energy uses up temperature of tall, job little, little to can lighting constituent chroma and calorific value limitation, the operation is handy as good as security.

Defect: Some aeriform combustion conditions are slashing, need high temperature, headroom and Gao Shuizheng to enrage cent to press, because this activator must have stability of taller active, high fever and taller hydro-thermal stability, and fight toxic ability certainly.

6, law of activated carbon adsorption

Activated carbon adsorption is will organic waste gas sends a person adsorptive bed by exhaust fan, organic waste gas makes in adsorptive bed gas gets depurative by adsorption of activated carbon sorbent, the aeriform platoon after purifying is finished namely to atmosphere purify a process.

Technological process pursues as follows:

Advantage: Adsorptive rate is high, moving specific power consumption is low, cost cost is low, on the safe side, apply to the man-trap that has explosion, sorbent can reclaim, energy-saving environmental protection.

Defect: Not high temperature resistant, irretentive below wet condition very good adsorptive ability; is combustible, achieve saturated adsorption more quickly and lose effectiveness; to produce solid or liquid contaminant 2 times.

7, biology law

Biology law is microbial will organic composition regards carbon as source and the sources of energy, decompose its a kind of method that is CO2 and H2O process.

Technological process pursues as follows:

Advantage: Equipment simple, investment little, moving fare is low, pollute without 2, handle ideal of effect of VOCs waste gas.

Defect: Reaction device covers an area of an area time of big, reaction is longer.

8, plasma decomposes a law

Plasma cent solution is to be below the action of adscititious electric field, what medium discharge arises is many carry can element of electronic bombard contaminant, caused a series of complex physics, chemical reaction, make thereby contaminant be able to a kind of waste gas of degradation purify administers a method.

Technological process pursues as follows:

Advantage: Craft is concise, low cost is energy-saving, equipment material fights oxidation strong, fight corrode, service life is long, can efficient purify contains the waste gas of the main contaminant such as gas of hydrogen of volatile organic matter, mineral, vulcanization, ammonia.

Defect: Plasma technology is in litter processing process, asks vacuum environment, brought particular technical difficult problem, still be in now be in research phase, at present a lot of research are aimed at onefold contaminant only.

9, UV is ultraviolet law

UV is ultraviolet the law is to use waste gas of tailor-made illuminate of beam of light of ultraviolet ray of UV of high-energy tall ozone, change the molecular structure of waste gas, make catenary of element of compound of waste gas of organic or inorganic high polymer is below illuminate of beam of light of high-energy ultraviolet ray, degradation is changed into the method of small element compound.

Technological process pursues as follows:

Advantage: Cover an area of an area small, moving cost is inferior, installation cost is inferior.

Defect: Purify efficiency is low, the aeriform sort that can handle is less.

10, law of biology drop filter

Law of biology drop filter is waste gas classics past dirt is added wet or drop in temperature after waiting for pretreatment craft, from filter bed bottom by fall to cross the filter bed that comprises by filter makings up, waste gas comes by gas phase move water, photograph of microbial mix up, the microbial metabolization function that attends through originallying to expect at filter and a kind of method that is decomposed.

Technological process pursues as follows:

Advantage: Processing fare is low, technological process is simple, zoology environmental protection.

Defect: Cover an area of an area big, filling needs to change regularly, the process is controlled not easily, after moving period of time appear easily problem, still exist to the processing of hydrophoby and material of degradation of bad live thing greater difficulty.